<PackageReference Include="Microsoft.IdentityModel.Tokens" Version="8.15.0" />

Microsoft.IdentityModel.Tokens.Experimental.SignatureKeyResolverDelegate

Resolves the signing key used for validating a token's signature.
namespace Microsoft.IdentityModel.Tokens.Experimental { public delegate SecurityKey SignatureKeyResolverDelegate (string token, SecurityToken securityToken, string kid, ValidationParameters validationParameters, BaseConfiguration configuration, CallContext callContext); }